表面引发接枝聚合制备MWCNTs-g-PMMA及对PVDF微孔膜性能的影响

Preparation of Multi-Walled Carbon Nanotubes-Graft-Polymethylmethacrylate by Surface Graft Polymerization and Its Influences on Characterization of Polyvinylidene Fluoride Microporous Membrane

以表面引发接枝聚合制备多壁碳纳米管接枝聚甲基丙烯酸甲酯(MWCNTs-g-PMMA)。通过非溶剂致相分离(NIPS)法制备聚偏氟乙烯(PVDF)/MWCNTs-g-PMMA复合微孔膜。通过差示扫描量热和衰减全反射红外光谱测试考察了微孔膜的热性能和结晶性能,通过水接触角和水通量测试分析了膜的亲水性能,通过场发射扫描电子显微镜和力学性能测试分析了膜的微观形貌和力学性能。随着MWCNTs-g-PMMA接枝率和含量的增大,PVDF复合微孔膜的结构和性能明显改善。当MWCNTs-g-PMMA接枝率和含量分别为28. 6%和1%时,PVDF复合微孔膜的亲水性能、结晶度、β相和力学性能相对纯PVDF膜提升最为明显。

Multi-walled carbon nanotubes-graft-polymethylmethacrylate （MWCNTs-g-PMMA） was synthesized by surface graft polymerization. The poly （viny!idene fluoride） （PVDF）/MWCNTs-g-PMMA） composite mieroporous membrane was prepared by nonsolvent induced phase separation（NIPS）. The thermal performance and crystallinity of the microporous membrane were investigated by differential scanning calorimetry （DSC） and attenuatedt0tal reflectance infrared spectroscopy （ATR-FTIR）. The hydrophilicity of the membrane was analyzed by the water contact angle and water flux measurements. The microstructure and mechanical properties of the membraneswere analyzed by field emission scanning electron microscope （FESEM） and mechanical tests. With the increasing of grafting degree of MWCNTs-g-PMMA and its amountadding into the PVDF membrane, the membrane performaces are improved obviously. When the grafting rate and content of MWCNTs-g-PMMA are 28.6 % and i %, respectively, the improvement of the hydtophilicity, crystallinity, ~ phase and mechanical properties of PVDF composite microporous membrane are the most significant.